Re: Re oil pipes

[Eric Worpe]

Two types of oil pipes seem to have been produced for the TC,
one from 18 SWG copper tube and the other from 20 SWG
steel tube. If these need replacing, then 16 SWG (0.064") copper
tube is available which after annealing can be bent to shape without
kinking.
Un-silver soldering the flange or banjo connectors is difficult, far
better to machine out the old pipe with a 3/8" end mill in a robust
pillar drill. The connector will need to be clamped securely.
Most of the stress on the connectors was due to the repeated
replacement of the original style oil filters; each time the banjo bolt
was turned, the pipe would be stressed at the point where it left the
connector and thus became work hardened as mentioned before.
This potential problem must have been anticipated at Abingdon
as the design of the connectors was changed from having an abrupt
cut-off where the pipe left the connector to an inclined cut-off.
It's worth checking that the filter body is clamped securely to the
block as any vibrations of the filter body relative to the block will
fatigue the pipe work.
Regards, Eric Worpe.

[AJChalmers@aol.com]

Contact Phil Marino - he does these flexible oil pipes and also makes, among
other items, a screw-on modern filter adapter:

16199 Hidden Cove Drive
Riverside, CA 92503

tel: 909 352 419

Not on the internet


[Non-text portions of this message have been removed]

[eworpe]

Attachments :

1. [url=file:///C:\Users\Steve\AppData\Local\PG Offline 4\Attachments\\image001-82374.jpg]image001-82374.jpg[/url]

Hi Norman,
The engine designers might have realised that a problem from fracturing oil pipes was possible as they altered the design of the connectors on the end of the pipes. Originally the connectors had an abrupt tail, which would have set up a stress concentration area directly where the pipe joins the connector. This was later modified to a tapered tail to extend the stress area but at a reduced level.
Repeated renewals of the oil filter would have resulted in the pipes being twisted just where they join the connectors due to the action of undoing or tightening up the banjo bolts. The combination of work hardened copper and exposure to vibrations would have sealed the fate of quite a few engines still running beyond the 1960s.
Occasionally I've come across steel oil pipes, so I wonder if these were upgraded replacements?
Regards, Eric.
________________________________________
From: 'Norman Verona' norman@frenchblat.com

I bought the one from Moss and I've kept the solid pipes. They have done 100,000 miles without a problem so I reckon they'll be OK. I can't remember fractured pipes being an issue when I was working on XPAG engined cars 50 years ago. Of course, higher output engine may have more vibration which may fracture the pipes.

[Roger Bateman]

Hi Eric,

This is something I should do. Who supplied your modern oil filter conversion and those flexi pipes, please?

Roger

[Norman Verona]

Eric,

In theory I shouldn't need to remove the pipes as the filter is changed from
the bottom. However I will remove the top one so I can fill; the filter.

Norman Verona
La Foie, 49520, Noellet, France
Tel: 0033 (0)2 41 92 73 44
Mob: 0033 (0)7 70 70 23 79
Web: www.frenchblat.com
MG Midget TC 10178


-----Original Message-----
From: e.worpe@surrey.ac.uk [mailto:e.worpe@surrey.ac.uk]
Sent: 25 November 2015 11:19
To: norman@frenchblat.com; mg-tabc@yahoogroups.com
Subject: Re oil pipes

Hi Norman,
The engine designers might have realised that a problem from fracturing
oil pipes was possible as they altered the design of the connectors on the
end of the pipes. Originally the connectors had an abrupt tail, which would
have set up a stress concentration area directly where the pipe joins the
connector. This was later modified to a tapered tail to extend the stress
area but at a reduced level.
Repeated renewals of the oil filter would have resulted in the pipes being
twisted just where they join the connectors due to the action of undoing or
tightening up the banjo bolts. The combination of work hardened copper and
exposure to vibrations would have sealed the fate of quite a few engines
still running beyond the 1960s.
Occasionally I've come across steel oil pipes, so I wonder if these were
upgraded replacements?
Regards, Eric.
________________________________________
From: 'Norman Verona' norman@frenchblat.com

I bought the one from Moss and I've kept the solid pipes. They have done
100,000 miles without a problem so I reckon they'll be OK. I can't remember
fractured pipes being an issue when I was working on XPAG engined cars 50
years ago. Of course, higher output engine may have more vibration which may
fracture the pipes.